#include "stm32f10x.h"                  // Device header
#define USART_Tx_Pin GPIO_Pin_9
#define USART_Rx_Pin GPIO_Pin_10
#define USART_Port 	GPIOA
int main(void)
{
	
		NVIC_InitTypeDef NVIC_InitStructure;
		GPIO_InitTypeDef GPIO_InitStructure;
		USART_InitTypeDef USART_InitStructure;
		
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
		/* Enable UART clock, if using USART2 or USART3 ... we must use RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) */
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); 
		
		/* Configure PA9 for USART Tx as alternate function push-pull */
		GPIO_InitStructure.GPIO_Pin = USART_Tx_Pin;
		GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
		GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
		GPIO_Init(USART_Port, &GPIO_InitStructure);

		GPIO_InitStructure.GPIO_Pin = USART_Rx_Pin;
		GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
			GPIO_Init(USART_Port, &GPIO_InitStructure);
		
		USART_InitStructure.USART_BaudRate = 9600;
		USART_InitStructure.USART_WordLength = USART_WordLength_8b;
		USART_InitStructure.USART_StopBits = USART_StopBits_1;
		USART_InitStructure.USART_Parity = USART_Parity_No;
		USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
		USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;	
	 
		/* USART configuration */
		USART_Init(USART1, &USART_InitStructure);
		
		NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
		NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
		NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;
		NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
		
		NVIC_Init(&NVIC_InitStructure);

		USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
		/* Enable USART */
		USART_Cmd(USART1, ENABLE);	
		while(1)
		{
			USART_SendData(USART1,0x30);
		}
}